Use the Ribbed Slab form to define the size, thickness, and load for the slab, the size and height of the columns, the size and spacing of joists, and the size of the transverse beams.
Plan Dimensions.
Along X Direction. The Left and Right Edge Distance edit boxes can be used to specify the extents of the slab beyond the outside grid lines. The Number of Spans and the Spacing edit boxes can be used to specify the grids in the X direction. Accept the defaults or specify values by typing directly in the edit boxes.
Along Y Direction. The Top and Bottom Edge Distance edit boxes can be used to specify the extents of the slab beyond the outside grid lines. The Number of Spans and Spacing edit boxes can be used to specify the grids in the Y direction. Accept the defaults or specify values by typing directly in the edit boxes.
Slab Thickness. Specify the thickness of the slab as either a fraction of the longest clear span length plus some additional value, or input the thickness directly.
Column Dimensions. Input the Column Size and the Column Height Below the model datum plane. A column property will be created based on the square column size specified.
Model Column Intersection as Stiff Slab check box. Check this check box if a stiff slab object should be added at the column location to account for the increase in slab stiffness over the column.
Load. Input surface loads for both dead (in addition to self weight) and live load patterns.
Create Auto Live Load Patterns check box. Check this check box if the program should automate the generation of pattern (skip) loading.
Rib Dimensions. Input the Depth (Includes Slab), Width Top and Bottom and Spacing for the ribs. Specify whether the joists run in the X or Y direction and their spacing. Depth is specified from the top of slab, typically the elevation of the model datum. This information is used by the program to create a slab property with equivalent stiffness in the direction of the joists. In addition, parallel to the direction of the joists, rectangular beams will be created along each slab edge and at interior grid lines, and will be located using an insertion point of top center at the model datum.
Transverse Beam. Input the Depth and Web Width of the beams that support the joists. Depth is specified from the top of slab, typically the elevation of the model datum. Using this information, the program creates rectangular beams transverse to the direction of the joists along each slab edge and at interior grid lines, and locates the beams using an insertion point of top center at the model datum.
TIP: The Calculator feature can be used to assist in mathematical operations during data entry. Place the mouse pointer/cursor in an edit box, hold down the Shift key and double click the left mouse button to access the form.
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Access the Ribbed Slab form as follows:
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